[PATCH] ppc64: correct return code in syscall auditing

This patch is from David Woodhouse <dwmw2@infradead.org>.

We were pretending that every syscall returned zero. Don't do that.
Signed-Off-By: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/kernel/entry.S

@@ -231,6 +231,7 @@ syscall_dotrace:
 syscall_exit_trace:
 	std	r3,GPR3(r1)
 	bl	.save_nvgprs
+	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	.do_syscall_trace_leave
 	REST_NVGPRS(r1)
 	ld	r3,GPR3(r1)
@@ -324,6 +325,7 @@ _GLOBAL(ppc64_rt_sigreturn)
 	ld	r4,TI_FLAGS(r4)
 	andi.	r4,r4,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP)
 	beq+	81f
+	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	.do_syscall_trace_leave
 81:	b	.ret_from_except
 

arch/ppc64/kernel/ptrace.c

@@ -313,10 +313,10 @@ void do_syscall_trace_enter(struct pt_regs *regs)
 		do_syscall_trace();
 }
 
-void do_syscall_trace_leave(void)
+void do_syscall_trace_leave(struct pt_regs *regs)
 {
 	if (unlikely(current->audit_context))
-		audit_syscall_exit(current, 0);	/* FIXME: pass pt_regs */
+		audit_syscall_exit(current, regs->result);
 
 	if ((test_thread_flag(TIF_SYSCALL_TRACE)
 	     || test_thread_flag(TIF_SINGLESTEP))